Transmission apparatus and signal transmission method

Abstract

A transmission device includes: a multiplex circular array antenna including a plurality of circular array antennas in which a plurality of antenna elements are arranged in a circle; a plurality of Butler circuits connected to the multiplex circular array antenna; and one or more Butler circuits connected to one or more linear array antennas including some antenna elements among the plurality of antenna elements of the multiplex circular array antenna.

1 . A transmission device comprising:
 a multiplex circular array antenna including a plurality of circular array antennas in which a plurality of antenna elements are arranged in a circle;   a plurality of Butler circuits connected to the multiplex circular array antenna; and   one or more Butler circuits connected to one or more linear array antennas including some antenna elements among the plurality of antenna elements of the multiplex circular array antenna.   
     
     
         2 . The transmission device according to  claim 1 , wherein a frequency band corresponding to the circular array antenna configuring the multiplex circular array antenna is different from a frequency band corresponding to the linear array antenna. 
     
     
         3 . The transmission device according to  claim 1 , further comprising:
 a selector configured to select a Butler circuit connected to a linear array antenna that transmits a signal or a circular array antenna that transmits a signal.   
     
     
         4 . A signal transmission method executed by a transmission device including a multiplex circular array antenna including a plurality of circular array antennas in which a plurality of antenna elements are arranged in a circle, a plurality of Butler circuits connected to the multiplex circular array antenna, and one or more Butler circuits connected to one or more linear array antennas including some antenna elements among the plurality of antenna elements of the multiplex circular array antenna, the signal transmission method comprising:
 selecting one or more Butler circuits from among the plurality of Butler circuits, and   inputting a signal with a frequency band corresponding to an array antenna connected to the selected Butler circuit to the selected Butler circuit.   
     
     
         5 . The signal transmission method according to  claim 4 , wherein one or more Butler circuits connected to one or more specific linear array antennas are selected, and the one or more specific linear array antennas are caused to transmit signals by using beams in a plurality of directions.